My first and only Woody Allen movie was Manhattan which my oldest sister suck me in to see when I was 12. I watched this geezer paw Mariel Hemmingway who was six years older than me. She tried to convince me that it was funny and it was art. I was very clear it was neither. His incestuous marriage did not surprise me.
I ripped the movie apart and turned in my review; consequently was chastised by my professor for applying my own morality to the assignment. At the time, I was a liberal myself but could not be shaken in my conviction that this was disgusting and wrong.
And you were 100% right--this movie was not funny nor was it art.